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/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.facebook.presto.jdbc.internal.guava.collect;

import static com.facebook.presto.jdbc.internal.guava.base.Preconditions.checkNotNull;

import com.facebook.presto.jdbc.internal.guava.annotations.GwtCompatible;
import java.util.Collection;
import java.util.Set;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A set which forwards all its method calls to another set. Subclasses should override one or more
 * methods to modify the behavior of the backing set as desired per the decorator pattern.
 *
 * 

Warning: The methods of {@code ForwardingSet} forward indiscriminately to the * methods of the delegate. For example, overriding {@link #add} alone will not change the * behavior of {@link #addAll}, which can lead to unexpected behavior. In this case, you should * override {@code addAll} as well, either providing your own implementation, or delegating to the * provided {@code standardAddAll} method. * *

{@code default} method warning: This class does not forward calls to {@code * default} methods. Instead, it inherits their default implementations. When those implementations * invoke methods, they invoke methods on the {@code ForwardingSet}. * *

The {@code standard} methods are not guaranteed to be thread-safe, even when all of the * methods that they depend on are thread-safe. * * @author Kevin Bourrillion * @author Louis Wasserman * @since 2.0 */ @GwtCompatible public abstract class ForwardingSet extends ForwardingCollection implements Set { // TODO(lowasser): identify places where thread safety is actually lost /** Constructor for use by subclasses. */ protected ForwardingSet() {} @Override protected abstract Set delegate(); @Override public boolean equals(@Nullable Object object) { return object == this || delegate().equals(object); } @Override public int hashCode() { return delegate().hashCode(); } /** * A sensible definition of {@link #removeAll} in terms of {@link #iterator} and {@link #remove}. * If you override {@code iterator} or {@code remove}, you may wish to override {@link #removeAll} * to forward to this implementation. * * @since 7.0 (this version overrides the {@code ForwardingCollection} version as of 12.0) */ @Override protected boolean standardRemoveAll(Collection collection) { return Sets.removeAllImpl(this, checkNotNull(collection)); // for GWT } /** * A sensible definition of {@link #equals} in terms of {@link #size} and {@link #containsAll}. If * you override either of those methods, you may wish to override {@link #equals} to forward to * this implementation. * * @since 7.0 */ protected boolean standardEquals(@Nullable Object object) { return Sets.equalsImpl(this, object); } /** * A sensible definition of {@link #hashCode} in terms of {@link #iterator}. If you override * {@link #iterator}, you may wish to override {@link #equals} to forward to this implementation. * * @since 7.0 */ protected int standardHashCode() { return Sets.hashCodeImpl(this); } }





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